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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_PIPE_H
#define MPD_PIPE_H
#include "gcc.h"
#ifndef NDEBUG
struct audio_format;
#endif
struct music_chunk;
struct music_buffer;
/**
* A queue of #music_chunk objects. One party appends chunks at the
* tail, and the other consumes them from the head.
*/
struct music_pipe;
/**
* Creates a new #music_pipe object. It is empty.
*/
gcc_malloc
struct music_pipe *
music_pipe_new(void);
/**
* Frees the object. It must be empty now.
*/
void
music_pipe_free(struct music_pipe *mp);
#ifndef NDEBUG
/**
* Checks if the audio format if the chunk is equal to the specified
* audio_format.
*/
bool
music_pipe_check_format(const struct music_pipe *pipe,
const struct audio_format *audio_format);
/**
* Checks if the specified chunk is enqueued in the music pipe.
*/
bool
music_pipe_contains(const struct music_pipe *mp,
const struct music_chunk *chunk);
#endif
/**
* Returns the first #music_chunk from the pipe. Returns NULL if the
* pipe is empty.
*/
gcc_pure
const struct music_chunk *
music_pipe_peek(const struct music_pipe *mp);
/**
* Removes the first chunk from the head, and returns it.
*/
struct music_chunk *
music_pipe_shift(struct music_pipe *mp);
/**
* Clears the whole pipe and returns the chunks to the buffer.
*
* @param buffer the buffer object to return the chunks to
*/
void
music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer);
/**
* Pushes a chunk to the tail of the pipe.
*/
void
music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk);
/**
* Returns the number of chunks currently in this pipe.
*/
gcc_pure
unsigned
music_pipe_size(const struct music_pipe *mp);
gcc_pure
static inline bool
music_pipe_empty(const struct music_pipe *mp)
{
return music_pipe_size(mp) == 0;
}
#endif
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